/**
* Generate next point
* @param n space dimensionality
* @param radius sphere radius
* @param center sphere center (null for 0)
* @param x resulting vector point
*/
static void nextPoint(int n, double radius, double * center, double* x) {
double norm;
Gaussian gauss;
gauss.setSeqLen(n);
norm = 0.;
for(int j = 0; j < n; j ++) {
x[j] = gauss.getRand();
norm += x[j] * x[j];;
}
double a;
a = radius / sqrt(norm);
for(int j = 0; j < n; j ++) {
x[j] *= a;
}
if(center) {
for(int j = 0; j < n; j ++) {
x[j] += center[j];
}
}
}
